2

1

f

2

6

f

2

2

f

10

‡

A

A

+

+

A

log

20

=

THD

ADC082S101

www.ti.com

SNAS288D – APRIL 2005 – REVISED MARCH 2013

TOTAL HARMONIC DISTORTION (THD) is the ratio, expressed in dB or dBc, of the rms total of the first five

harmonic components at the output to the rms level of the input signal frequency as seen at the output. THD is

calculated as

where

•

Af1 is the RMS power of the input frequency at the output and Af2 through Af6 are the RMS power in the first 5

harmonic frequencies. Accurate THD measurement requires a spectrally pure sine wave (monotone) at the

ADC input.

(2)

THROUGHPUT TIME is the minimum time required between the start of two successive conversion. It is the

acquisition time plus the conversion and read out times. In the case of the ADC082S101, this is 16 SCLK

periods.

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